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Method for achieving linear structured light three-dimensional measurement by means of phase calculation

A linear structured light and phase calculation technology, applied in the field of optical three-dimensional sensing, can solve the problems of weak anti-interference ability, limited accuracy, low calculation efficiency, etc., and achieve strong anti-interference ability, high three-dimensional measurement accuracy, and high calculation efficiency. Effect

Active Publication Date: 2014-11-05
SICHUAN UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method based on phase calculation for the defects of low calculation efficiency, weak anti-interference ability and limited precision of the current three-dimensional measurement method of line structured light based on peak detection. This method has the advantages of ensuring high measurement accuracy High computing efficiency and strong anti-interference ability

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  • Method for achieving linear structured light three-dimensional measurement by means of phase calculation
  • Method for achieving linear structured light three-dimensional measurement by means of phase calculation

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Embodiment Construction

[0012] The present invention will be described in further detail below in conjunction with the accompanying drawings and working principles.

[0013] attached figure 1 It is a structural diagram of the three-dimensional measurement system of the present invention, in which 101 is a camera, 102 is a projector, 103 is a computer, and 104 is a sample to be tested. The device used has a CASIO XJ-M140 projector, and the projector buffer frame size is pixels, the gray quantization level is 8bit, the maximum output frequency of the projector is 150 frames / s; 1 Prosilica GC650 industrial camera, the resolution is pixels, the gray quantization level is 8bit, and the maximum capture frequency of the camera is 62 frames / s. 1 computer with Core i3 3530 CPU, 4GB RAM. The computer controls the structured light projection and shooting process. attached figure 2 It is a flow chart of the three-dimensional measurement method of line structured light in this embodiment. The specific i...

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Abstract

The invention discloses a method for achieving linear structured light three-dimensional measurement by means of phase calculation in the three-dimensional sensor technology. The method comprises the steps that linear scanning is carried out on an object to be measured through projection equipment, a linear structured light image sequence is recorded through a photographic device, a fundamental frequency phase and a plurality of high-frequency cut-off phases are worked out by the adoption of a phase calculation formula of the phase measurement profilometry, an absolute phase is obtained according to a time phase unfolding method, an area with the low signal to noise ratio in a phase diagram is filtered out according to brightness modulation, and finally three-dimensional coordinates on the surface of the object to be measured are worked out according to phase and system calibration parameters. The method can be used for the linear structured light three-dimensional measurement technology comprising laser ray scanning. The method has the advantages of being high in calculation efficiency, anti-jamming capability and measurement precision.

Description

technical field [0001] The invention relates to optical three-dimensional sensing technology, in particular to realizing three-dimensional measurement on the surface of a target object by projecting line structured light. [0002] Background technique [0003] The 3D measurement technology based on structured light projection has a wide range of applications in industrial production and scientific research due to its advantages of non-contact and high measurement accuracy, such as industrial inspection, reverse engineering, 3D biometric recognition, and auxiliary medical diagnosis. Structured light technology includes the following basic steps: use a projection device to project a structured light coding pattern to the target object, and then use a camera device to take pictures simultaneously, obtain the corresponding relationship between the camera space and the projection space through decoding, and then use the triangulation principle to obtain the three-dimensional coor...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/25G01B11/03
Inventor 刘凯龙云飞郑晓军吴炜杨晓敏
Owner SICHUAN UNIV
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